"Corresponds to the first 2 vols of the German edition [of the Beiträge], and containing essays I-LXXII. In the first essay, Klaproth describes the results of subjecting numerous mineral substances to the intense heat of a "porcelain fire," among them, feldspars, alabaster, marble, beryl (& emerald), tourmaline, quartzes, chrysoberyls, olivines, kyanite, opals, garnets, zircons, corundums, spinels, topazes, etc. Specific experiments and analyses on gemstones as follows: oriental sapphire, cat's-eye, chrysoberyl, chrysolite, olivine, lapis lazuli, zircon, spinel, Colombian emerald, oriental garnet, vesuvianite, leucite, staurolite, chrysoprase, Hungarian opal, hydrophane, common opals, meerschaum, Chinese agalmatolite, spessartine."--Gemology by J. Sinkankas, entry no. 3437.